What does it mean when my boyfriend jokes about me cheating?

I cheated on him so many times he got mad and now months later he jokes about me cheating on him and when I’m with him he says cheater! Lol and smiles and laughs and says cheating girlfriend!! He says this quite a lot and and also said yesterday I had a girl over and joked around with me saying I had another girl over last night and called me a different girl name during sex and he smiled. What does it mean when he does this and is this a red flag?

Updates
2 mo
He also called me a different girls name as a joke. He said he was joking around with me. Just to add.
What does it mean when my boyfriend jokes about me cheating?
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